$\int-\frac{1}{9x\sqrt{81x^2-9}}dx$
$f\left(x\right)=-2x^4+5x^3-x$
$6^{5\:}x\:7^5$
$\int\frac{1}{\sqrt[2]{e^{2x}-1}}dx$
$\lim_{x\to\infty}\left(e^{-x^4}\right)$
$x\:+\:6\:=\:-7x\:-\:2$
$\left(2xy\right)dy\:=\:\left(4x^2+3y^2\right)dx$
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